Home
Class 12
CHEMISTRY
Assertion:Substances like Fe3O4 and MgFe...

Assertion:Substances like `Fe_3O_4` and `MgFe_2O_4` lose ferrimagnetism on heating and become paramagnetic
Reason : Magnetic moments of the domains in these substances are aligned in parallel and antiparallel directions in unequal numbers.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • THE SOLID STATE

    NCERT FINGERTIPS|Exercise NCERT Exemplar|37 Videos

  • THE P-BLOCK ELEMENTS

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

A : Fe_(3)O_(4) is ferrimagnetic at room temperature but becomes paramagnetic at 850 K. R : The magnetic moment in Fe_(3)O_(4) are aligned equally in parallel and antiparallel directions which on heating randomise.

Assertion : Fe_(3)O_(4) is paramagnetic at room temperature and becomes ferromagnetic at 850 K Reason : The randomization of spin takes place with temperature.

Assertion : Ferro magnetic substances become paramagnetic above Curie temp. Reason : Domains are destroyed at high temp.

Fe_(3)O_(4) is ferrimagnetic at room temperature but at 850K it becomes::

The magnetic moment of [Fe(CO)_4(C_2O_4)]^+ is

Assertion : The properties of paramagnetic and ferromagnetic substance are not effected by heating. Reason : As temperature rises, the alignment of molecular magnets gradually decreases.

The substances which contain species with unpaired electrons in their orbitals behave as paramagnetic sustances. Such substances are weakly attracted by the magnetic field. The paramagnetism is expressed in terms of magnetic moment. The magnetic moment is related to the number of unpaired electrons according tot he following relation: Magnetic moment mu=sqrt(n(n+2))BM where n=number of unpaired electrons. BM stands for Bohr magneton, a unit of magnetic moment. 1BM=(eh)/(4pimc)=9.27xx10^(-24)Am^(2) or JT^(-1) Q. Which of the following ions has magnetic moment equal to that of Ti^(3+) ?